freedom is right, we  make mistakes and we've to learn from it. You already caused trouble(may be you were helping or just being good, but not it's a trouble) by lending money among your friends which in first place you should have never done. Money breaks relations.. I've never seen it making, I remember a shirt 'No Money, No Honey' , 'honey' here could be compared with anyone like your friends, etc.
So, let it go.. am laughing at  'MY Money' lol....
someone took 2500 from me, and never returned it to me,  I was being good fella, but after a while I simply let it go, and learnt my lesson, ever since, no money lending among friends, I lost one friend don't wanna lose others as well.
If you insist going after them and teaching them lesson, be ready for more troubles you are going to invite. You'll be responsible for everything.